Lake Zoar Authority | Water Quality Monitoring
The Lake Zoar Authority is a multi-town organization consisting of representatives from the four towns that border the lake - Monroe, Newtown, Oxford, and Southbury. The Lake Zoar Authority is tasked with the goals of improving water quality and promoting safe boating on the lake.
Lake Zoar Authority, Lake Zoar, CT, Connecticut, Newtown, Southbury, Oxford, Monroe
50494
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Water Quality Monitoring

Water quality is a primary area of focus for the Lake Zoar Authority. Beginning in 2020, Western Connecticut State University’s Cyanobacteria Monitoring Program includes Lake Zoar in a weekly water testing program. The annual program monitors Cyanobacteria in regional lakes during the summer months when blooms are most likely. When Microcystin toxin levels exceeded federal and state limits, public beaches are closed. The towns and DEEP also test water at public beaches.

The LZA’s role is information gathering. The LZA also participates in water studies to learn more about the changing conditions of the water. In addition to quality, the LZA has an extensive program to control the growth of invasive weeds and as funds allow the most infested areas are treated with an herbicide that is used in over 150 lakes in CT each year.

Submitted herein are test results and survey reports for public interest.

For additional information, please visit:

CT DEEP Lake and Pond Water Quality Monitoring Program

CT DEEP Lake Water Quality Management

WCSU Environmental Research Project

SOLitude Lake Management

FirstLight Power

Local Health Departments:

Monroe

Newtown

Oxford & Southbury

  • Lake Zoar Treatment Notice:
    Second Herbicide
    Application Scheduled:
    September 27, 2022

    NOTIFICATION OF AQUATIC TREATMENT SCHEDULING LAKE ZOAR MONROE, NEWTOWN, OXFORD, SOUTHBURY Last Updated 9/21/2021 2:40 PM est In accordance with CT DEEP, Pesticide Division notification requirements, selected areas of Lake Zoar will be chemically treated with Reward (Diquat) herbicide targeting control of the aquatic nuisance......

  • Lake Zoar
    Mid-Season
    Treatment Survey

    Results for Survey Conducted on September 7th, 2022 Pre-treatment Survey: survey conducted on June 3rd, 2022 Treatment Date:  June 28th, 2022 Post-Treatment Survey: To be conducted after treatment to evaluate success. Treatment Areas (shown in Map 1): Area Size (acres) Treatment Requirement 1B 0.7 Treatment......

  • Microcystin Report for
    September 2, 2022

    “Here are this week’s assay results for Microcystin levels at tested public beach sites. Samples were collected August 31st, 2022. Results meet the assay kit’s QC criteria.   The U.S. EPA and CT DPH currently advise a Microcystin threshold of 8.0 parts per billion (ppb; µg/L) for recreational waters. Thank you......

  • Microcystin Report for
    August 26, 2022

    “Here are this week’s assay results for Microcystin levels at tested public beach sites. Samples were collected August 24th, 2022. Results meet the assay kit’s QC criteria.   The U.S. EPA and CT DPH currently advise a Microcystin threshold of 8.0 parts per billion (ppb; µg/L) for recreational waters.  Thank......

  • Microcystin Report for
    August 19, 2022

    “Here are this week’s assay results for Microcystin levels at tested public beach sites. Samples were collected August 17th, 2022. Results meet the assay kit’s QC criteria.   The U.S. EPA and CT DPH currently advise a Microcystin threshold of 8.0 parts per billion (ppb; µg/L) for recreational waters.  Thank......

  • Microcystin Report for
    August 11, 2022

    “Here are this week’s assay results for Microcystin levels at tested public beach sites. Samples were collected August 10th, 2022. Results meet the assay kit’s QC criteria.   The U.S. EPA and CT DPH currently advise a Microcystin threshold of 8.0 parts per billion (ppb; µg/L) for recreational waters.  Thank......

  • Microcystin Report for
    August 4, 2022

    “Here are this week’s assay results for Microcystin levels at tested public beach sites. Samples were collected August 3rd, 2022. Results meet the assay kit’s QC criteria.   The U.S. EPA and CT DPH currently advise a Microcystin threshold of 8.0 parts per billion (ppb; µg/L) for recreational waters.  Thank......

  • Microcystin Report for
    July 28, 2022

    “Here are this week’s assay results for Microcystin levels at tested public beach sites. Samples were collected July 27th, 2022. Results meet the assay kit’s QC criteria.   The U.S. EPA and CT DPH currently advise a Microcystin threshold of 8.0 parts per billion (ppb; µg/L) for recreational waters.  Thank......

  • Microcystin Report for
    July 21, 2022

    “Here are this week’s assay results for Microcystin levels at tested public beach sites. Samples were collected July 20th, 2022. Results meet the assay kit’s QC criteria.   The U.S. EPA and CT DPH currently advise a Microcystin threshold of 8.0 parts per billion (ppb; µg/L) for recreational waters.  Thank......

  • Microcystin Report for
    July 13, 2022

    “Here are this week’s assay results for Microcystin levels at tested public beach sites. Samples were collected July 13th, 2022. Results meet the assay kit’s QC criteria.   The U.S. EPA and CT DPH currently advise a Microcystin threshold of 8.0 parts per billion (ppb; µg/L) for recreational waters.  Thank......

  • Microcystin Report for
    July 7, 2022

    “Here are this week’s assay results for Microcystin levels at tested public beach sites. Samples were collected July 6th, 2022. Results meet the assay kit’s QC criteria.   The U.S. EPA and CT DPH currently advise a Microcystin threshold of 8.0 parts per billion (ppb; µg/L) for recreational waters. Thank you......

  • Microcystin Report for
    July 1, 2022

    “Here are this week’s assay results for Microcystin levels at tested public beach sites. Samples were collected June 29th, 2022. Results meet the assay kit’s QC criteria.   The U.S. EPA and CT DPH currently advise a Microcystin threshold of 8.0 parts per billion (ppb; µg/L) for recreational waters.  Thank......

  • Lake Zoar Treatment Notice:
    Herbicide Application
    Scheduled:
    June 28, 2022

    NOTIFICATION OF AQUATIC TREATMENT SCHEDULING LAKE ZOAR MONROE, NEWTOWN, OXFORD, SOUTHBURY Last Updated 6/25/2021 6:05 PM In accordance with CT DEEP, Pesticide Division notification requirements, selected areas of Lake Zoar will be chemically treated with Reward (Diquat) herbicide targeting control of the aquatic nuisance plants......

  • Pre Treatment Survey
    June 3, 2022

     Download the full report here...

  • Lake Zoar 2021
    Invasive Aquatic Plant
    Management Results

    Prepared by Northeast Aquatic Research, 74 Higgins Highway, Mansfield Center, CT 06250  December 21, 2021 Summary  Invasive aquatic plants in designated management areas in Lake Zoar were treated with the herbicide Tribune (diquat) on August 4th, 2021. Approximately 80 acres of invasive Eurasian milfoil (Myriophyllum......